Globe.



- Patented Ian. 9, I900. T. W. SYNNHTT.

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THOMAS W. SYNNOTT, OF VVENONAH, NEW JERSEY.

GLOBE.

SPECIFICATTON forming part of Letters Fatent No. 641,166, dated January 9, 1900.

Application filed December 22, 1897- Serial No. 662,965. (No model.)

T0 at whom it may, concern.-

Be it known that I, THOMAS W. SYNNOTT, a citizen of the United States, residing at Wenonah, in the countyof Gloucester, State of New Jersey, have invented a new and useful Improvement in Lamp-Globes, which improvement is fully set forth in the following specification and accompanying drawings.

My invention consists of an improved construction of lamp-globe especially adapted for use with incandescent and other lamps, the exterior surface of said globe having provided thereon bulbous formations-such as bullseyes, rings, &c.-said globe being of substantially uniform diameter for the greater portion of its length, while its interior surface is provided with longitudinally-extending flutes having inclined sides of substantially equal length, the top and bottom faces of said flutes being rectilinear and substantially parallel to each other, while said inner surface may be of any desired cross-section, such as a circular, pentagonal, hexagonal, or polygonal figure.

It further consists of novel details of construction, all as will be hereinafter fully set forth, and particularly pointed out in the claims.

Figure 1 represents a side elevation of a portion of a mold, showing a plunger in elevation therein in the act of forming a globe. Figs. 2 and 3 represent side elevations showing my improved globe provided with bulbous formations. Fig. 4 represents a transverse section of a globe having a pentagonal or similar polygonal inner surface provided with longitudinally-extending flutes. Fig. 5 represents a transverse section on line y 11 Fig. 2.

Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings, A designates a lamp-globe which may be provided with bulloous formations B as seen in Figs. 2 and 5, or with a circumferential or annular bulge or ring, as seen in Fig. 3, said globe being otherwise of uniform diameter throughout the majorportion of its length and having its lower portion curved or arc-shaped, as at B. The

inner periphery or surface of the globe is preferably provided with a series of longitudinally-extending flutes or recesses O, which have inclined sides of substantially equal length and rectilinear tops and bases, said sides meeting said bases, which are substantially parallel to said tops, wherefrom it will be seen that additional surfaces are formed, whereby the light is softened and diffused to a great extent.

The inner surface of the globe may be of any desired formation in cross-section, as circular, pentagonal, or other polygonal form.

II designates a rim or flange which may be formed by the same operation in which the globe is produced.

M designates a plunger having its exterior configuration shaped to conform to the desired interior surface of the globe.

In Fig. 1 the mold is of such a shape that a bulbous contour will be imparted to said ex terior peripheryin this particular instance an annular formation.

It will be understood that when it is desired to producea globe having a plain or fluted polygonal or cylindrical interior surface the shape of the plunger will be accordingly modified, and when it is desired to produce bullseyes upon the exterior surface, as indicated in Fig. 2, the shape of the mold will be correspondingly changed. The globe seen in Figs. 2 and 3 may be internally shaped as seen in Figs. 4; and 5, and, if desired, the mouth of the globe may be flaring, since this can be eifected during the manufacture by a single operation.

The operation is as follows: The molten glass or other materialis introduced into the mold J, and the plunger M is inserted in the manner illustrated, it being noted that the globe in each instance is produced by a single operation, and by making the mouth of uniform diameter or larger than the rest of the globe there is no necessity for reheating have their mouths contracted by a separate operation, which adds greatly to the cost of manufacture.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. As an iniproved article of manufacture, a globe having an exterior surface of uniform diameter for the greater portion of its length provided with bulbous formations near its mid height, said formations being spaced both vertically and circumferentially of the globe, the interior surface of the latter being provided with a series of substantially parallel flutes, each having a rectilinear top and a base substantially parallel to each other and joined byinclined sides of substantially equal length, whereby a plurality of faces are produced and the light is softened and diffused.

2. As an improved article of manufacture, a lamp-globe of uniform diameter throughout the major portion of its length and provided with a series of exterior bulbous formations near its mid-height, said formations being 25 above and below said formations and having 0 its interior surface provided with a series of longitudinally extending flutes of varying length, and each flute having a rectilinear top and base joined by inclined sides of substantially equal length, whereby a plurality of 35 faces are produced.

THOMAS W. SYNNOTT. VVit-nesses:

JOHN A. WIEDERSHEIM, E. HAYWARD FAIRBANKS. 

